US4672812A - Braking booster servomotor of lightened structure - Google Patents

Braking booster servomotor of lightened structure Download PDF

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Publication number
US4672812A
US4672812A US06/441,716 US44171682A US4672812A US 4672812 A US4672812 A US 4672812A US 44171682 A US44171682 A US 44171682A US 4672812 A US4672812 A US 4672812A
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US
United States
Prior art keywords
master cylinder
housing
dash board
casing
cylindrical body
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US06/441,716
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English (en)
Inventor
Jean-Jacques Carre
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bendix France SA
DBA SA
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DBA SA
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Filing date
Publication date
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Assigned to BENDIX FRANCE reassignment BENDIX FRANCE ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: CARRE, JEAN-JACQUES
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
    • B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
    • B60T13/24—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release the fluid being gaseous
    • B60T13/46—Vacuum systems
    • B60T13/52—Vacuum systems indirect, i.e. vacuum booster units
    • B60T13/567—Vacuum systems indirect, i.e. vacuum booster units characterised by constructional features of the casing or by its strengthening or mounting arrangements
    • B60T13/5675—Supportstruts

Definitions

  • the present invention primarily concerns a brake booster servomotor made of lightened structure and is more particularly concerned with a closure arrangement of the casing of the servomotor.
  • the closure arrangement permits the shells to be made of lighter material, in particular plastic material, without the overall performance of the servomotor with respect to substantial forces transmitted by the driver at the moment of braking, being affected thereby.
  • the master cylinder has been associated with a booster servomotor of the vacuum type wherein the thrust rod was connected to the braking pedal by means of a suitable linkage.
  • the casing of the servomotor has one of its faces fixed to a wall member of the vehicle and of the other face to the master cylinder.
  • the casing both formed the support for the master cylinder and was sufficiently rigid to resist without substantial deformation the axial thrust forces transmitted to the input of the master cylinder when the driver operates the brake pedal.
  • the casings of vacuum-type booster servomotors have long been made of relatively thick sheet metal which is much thicker than the thickness that would normally be required in order simply to withstand the crushing forces resulting from the effect of the depression existing in the casing of the servomotor when the servomotor has not been actuated.
  • the assembly of the servomotor and the master cylinder might be mounted to a fixed part of the vehicle, not at the location of the connection between the servomotor and the braking pedal but, in contrast, at the location of the junction between the servomotor and the master cylinder.
  • the servomotor must be housed within the passenger compartment of the vehicle, or the assembly must be mounted by using a plurality of hoop members which form the fixing between a fixed wall member of the vehicle and the master cylinder, while passing around the servomotor.
  • the invention approaches the latter solution, while proposing an assembly of smaller size, for a lower cost price.
  • the invention disclosed herein concerns a braking booster servomotor intended to be interposed between an actuating member and a master cylinder.
  • the servomotor includes two shells forming a substantially cylindrical casing in which there is located an assembly forming a drive piston separating said casing into two pressure chambers.
  • a rigid force-transmitting stirrup member comprising fixing means at each end is forcibly mounted about said shells in order to contribute to closure of the casing.
  • the casing has at least one depression which extends substantially radially from the periphery of the casing and which forms a housing which holds the rigid stirrup member in a fixed position.
  • the depression makes it possible to manufacture a servomotor whose radial bulk is not increased by virtue of the provision of the stirrup members.
  • the stirrup member contributes to closure of the casing and, in most cases, makes it possible to avoid the necessity for a peripheral crimping operation on the two shells of the casing, which constitutes an appreciable financial saving and a saving of time, in production. Since the two shell members need not be crimped together, the servomotor now becomes dismantleable.
  • the booster servomotor has a casing formed by two shells each of which have a diametrically opposed depressed section.
  • a mounting member has stirrups that are located in the depressed sections to attach a master cylinder to a stationary support. The stirrups carry reactionary forces that develop in the master cylinder to the stationary support without deforming or deflecting the casing.
  • FIG. 1 is a plan view of the servomotor according to the invention
  • FIG. 2 is a view in section taken along line II--II of FIG. 1;
  • FIG. 3 is a partial view in section taken along line III--III in FIG. 1;
  • FIG. 4 is a schematic illustration of the servomotor with a master cylinder attached thereto.
  • the vacuum pneumatic booster servomotor has a casing 10 which is formed by two shells 12 and 14 which are assembled at their periphery.
  • the periphery of the two shells 12 and 14 grip between them the outside edge portion of a flexible diaphragm 16 which forms an enlarged bead 15.
  • the flexible diaphragm 16, rigid plate 18, form a drive piston assembly 20.
  • the drive piston 20 divides the casing 10 into two chambers 22 and 24.
  • the low pressure chamber 22 is in permanent communication with a vacuum source by way of a non-return valve 24.
  • the high pressure chamber 26 is capable of being brought into communication with atmosphere by way of an air filter 27.
  • the plate 18 is associated with a central hub member 28 which projects outwardly of the casing 10 in the direction of the actuating members of the servomotor. Disposed in the hub member 28 is a control valve device 30 of the three-way type.
  • the control valve 30 has an annular valve member 32 which is capable of bearing alternatively against seats 34 and 40.
  • Seat 34 is fixed with respect to an input actuating rod 36 connected to the pedal (not shown) for operating the brakes and associated with a reaction device 38 formed by a rubber disc while seat 40 is fixed with respect to the drive piston 20.
  • the reaction disc 38 is in contact with one end of a thrust rod 42 which is capable of operating an external actuating means (not shown) such as for example a brake master cylinder.
  • a spring 44 which bears against the shell 12 urges the drive piston 20 toward its rest position adjacent shell 14.
  • valve member 32 When the servomotor is in the rest position as illustrated, the valve member 32 is away from the seat 40 so as to permit the two chambers 22 and 26 to communicate by way of passages as shown at 46 and 48, through the hub member 28. In contrast, when the valve member 32 bears sealingly against the seat 34, the communication between atmosphere and the high pressure chamber 26 is interrupted.
  • the rod 36 When the driver of the vehicle operates the brake pedal, the rod 36 is displaced towards the left as shown in FIG. 2 so as to permit the annular valve member 32 to bear against the seat 40 and interrupt the communication between the low pressure chamber 22 and the high pressure chamber 26. Thereafter the valve member 32 moves away from the seat 34 to permit atmospheric air to pass through the filter 27 and the central part of the valve member 32 into the high pressure chamber 26 by way of the passage 48.
  • a pressure difference is generated between the two chambers 22 and 26, which causes the drive piston 20 to be moved towards the left, displacing the thrust rod 42 and causing actuation of the master cylinder (not shown).
  • a reaction force is transmitted from the thrust rod 42 to the input rod 36 by way of the disc 38 acting on an extension portion 50 of the seat 34.
  • the driver of the vehicle can continue to operate the master cylinder, at the expense of a greater force applied to the brake pedal.
  • the input rod 36 is pushed inwardly, which urges the extension portion 50 against the transmission disc 38 which transmits the force to the thrust rod 42 which cooperates with the master cylinder.
  • the casing 10 is provided with two diametrically opposed depressions 52, 52' which extend substantially radially from the periphery.
  • Each depression 52, 52' forms a housing for receiving a rigid force-transmitting bracing or stirrup member 54, 54'.
  • Each stirrup member 54, 54' has fixing means at each end thereof in the form of screws 56 and 58.
  • the threaded part of the screws 56 and 58 project outwardly from the two main faces of the casing 10.
  • the screws 56, only one is shown, permit the members 54, 54' to be fixed to a fixed wall member of the vehicle while the screws 58, only one is shown, permit mounting of the master cylinder 11 shown in FIG. 4.
  • Each stirrup member 54, 54' is cast in a light alloy which has lateral ribs 60 for increasing its rigidity. Its general shape is that of a U of which the two parallel limbs 62 carry the two screws 56 and 58 respectively.
  • the two limbs 62, 62' are provided on their opposite internal faces with rectangular recesses 64 (see FIG. 3) which prevent the screws 56 and 58 from rotating, the screws being provided with square or rectangular heads 66 for that purpose.
  • the outside faces of the shells 12 and 14 have positioning sliding guides 68, 68' which are formed integrally with the shells.
  • each member 54, 54' is slightly less than the natural thickness of the casing 10.
  • Each member 54, 54' is forcibly mounted about the shells 12 and 14 in order to contribute to closure of the casing 10.
  • the expression "natural thickness” denotes the axial distance between the main opposite outside faces of the shells 12 and 14 and more particularly the regions thereof against which the stirrup members 54, 54' bear, when the shells 12 and 14 are not resiliently deformed and when the peripheral bead 15 of the diaphragm 16 has not been compressed.
  • the two members 54, 54' are forcibly mounted about the shells 12 and 14, they cooperate therewith to participate in comprising bead 15 of the diaphragm 16 between the assembly edges 70 and 72 of the shells 12 and 14 to seal chambers 22 and 26 from the surrounding environment.
  • peripheral crimping of the edges 70 and 72 is not absolutely essential, it is possible to provide cooperating crimping between the edges 70 and 72 by bending tab 74 over a part of their periphery on shell 14. As seen in FIG. 1, the cooperating crimping extend only over two diametrically opposed edge portions which are preferably substantially equidistant from the depressions 52. This partial crimping configuration is advantageous in regard to servomotors of large diameter.

Landscapes

  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Braking Systems And Boosters (AREA)
US06/441,716 1980-02-22 1982-11-15 Braking booster servomotor of lightened structure Expired - Lifetime US4672812A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8003951A FR2476574A1 (fr) 1980-02-22 1980-02-22 Servomoteur d'assistance au freinage a structure allegee
FR8003951 1980-02-22

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
US06235282 Continuation-In-Part 1981-02-17

Publications (1)

Publication Number Publication Date
US4672812A true US4672812A (en) 1987-06-16

Family

ID=9238877

Family Applications (1)

Application Number Title Priority Date Filing Date
US06/441,716 Expired - Lifetime US4672812A (en) 1980-02-22 1982-11-15 Braking booster servomotor of lightened structure

Country Status (5)

Country Link
US (1) US4672812A (fr)
JP (1) JPS56135365A (fr)
DE (1) DE3106241A1 (fr)
FR (1) FR2476574A1 (fr)
GB (2) GB2070170B (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4826121A (en) * 1987-07-31 1989-05-02 Allied Signal Inc. Fastener for securing a shell to a firewall

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56120443A (en) * 1980-02-27 1981-09-21 Aisin Seiki Co Ltd Brake booster for automobile
JPS6243882Y2 (fr) * 1980-07-25 1987-11-16
DE3032049A1 (de) * 1980-08-26 1982-04-08 Alfred Teves Gmbh, 6000 Frankfurt Unterdruckgehaeuse fuer einen bremskraftverstaerker
JPS6228533Y2 (fr) * 1980-11-12 1987-07-22
DE3203496A1 (de) * 1982-02-03 1983-08-04 FAG Kugelfischer Georg Schäfer & Co, 8720 Schweinfurt Vorrichtung zur befestigung eines bremskraftverstaerkers und eines hauptbremszylinders
GB2117466B (en) * 1982-03-27 1985-06-19 Automotive Products Plc Reinforcing brake boosters
DE3238031A1 (de) * 1982-10-14 1984-04-19 Alfred Teves Gmbh, 6000 Frankfurt Bremskraftverstaerker-hauptzylinder-anordnung fuer kraftfahrzeuge
DE3322980A1 (de) * 1983-06-25 1985-01-10 Alfred Teves Gmbh, 6000 Frankfurt Ventileinrichtung fuer unterdruck-bremskraftverstaerker
FR2860471B1 (fr) * 2003-10-06 2006-01-20 Bosch Gmbh Robert Servomoteur pneumatique d'assistance au freinage a couvercle resistant.
CN111319597A (zh) * 2020-03-31 2020-06-23 常州中车铁马科技实业有限公司 驱动模块、电机械制动装置、制动夹钳单元及轨道车辆

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2267280A (en) * 1937-10-15 1941-12-23 Hermes Patentverwertungs Gmbh Device for conveying fluids
US2862365A (en) * 1952-11-26 1958-12-02 Kelsey Hayes Co Booster brake mechanism
US3498189A (en) * 1967-03-11 1970-03-03 Daimler Benz Ag Double-acting pneumatic servo-motor,especially adjusting motor for flaps or other reciprocating structural parts in motor vehicles
FR1603948A (fr) * 1968-01-12 1971-06-14
US3613513A (en) * 1968-04-24 1971-10-19 Avm Corp Dual diaphragm three-position actuator
FR2160222A5 (fr) * 1971-11-13 1973-06-22 Girling Ltd
US3777625A (en) * 1970-05-15 1973-12-11 Daimler Benz Ag Pneumatic servomotor
US3977308A (en) * 1974-03-18 1976-08-31 Aeroquip Corporation Double piston brake actuator
FR2421776A1 (fr) * 1978-04-04 1979-11-02 Teves Gmbh Alfred Unite de freinage assiste a commande mecanique pour vehicule automobile
US4270353A (en) * 1977-10-20 1981-06-02 Girling Limited Servo boosters for vehicle brake systems
EP0009393B1 (fr) * 1978-09-20 1982-07-21 Tokico Ltd. Multiplicateur de force pneumatique

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2830262A1 (de) * 1978-07-10 1980-01-24 Teves Gmbh Alfred Bremskraftverstaerker fuer ein kraftfahrzeug

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2267280A (en) * 1937-10-15 1941-12-23 Hermes Patentverwertungs Gmbh Device for conveying fluids
US2862365A (en) * 1952-11-26 1958-12-02 Kelsey Hayes Co Booster brake mechanism
US3498189A (en) * 1967-03-11 1970-03-03 Daimler Benz Ag Double-acting pneumatic servo-motor,especially adjusting motor for flaps or other reciprocating structural parts in motor vehicles
FR1603948A (fr) * 1968-01-12 1971-06-14
US3613513A (en) * 1968-04-24 1971-10-19 Avm Corp Dual diaphragm three-position actuator
US3777625A (en) * 1970-05-15 1973-12-11 Daimler Benz Ag Pneumatic servomotor
FR2160222A5 (fr) * 1971-11-13 1973-06-22 Girling Ltd
US3977308A (en) * 1974-03-18 1976-08-31 Aeroquip Corporation Double piston brake actuator
US4270353A (en) * 1977-10-20 1981-06-02 Girling Limited Servo boosters for vehicle brake systems
FR2421776A1 (fr) * 1978-04-04 1979-11-02 Teves Gmbh Alfred Unite de freinage assiste a commande mecanique pour vehicule automobile
US4246755A (en) * 1978-04-04 1981-01-27 Itt Industries, Inc. Mechanically controlled power brake unit
EP0009393B1 (fr) * 1978-09-20 1982-07-21 Tokico Ltd. Multiplicateur de force pneumatique

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4826121A (en) * 1987-07-31 1989-05-02 Allied Signal Inc. Fastener for securing a shell to a firewall

Also Published As

Publication number Publication date
GB2070170B (en) 1983-12-14
JPS56135365A (en) 1981-10-22
GB2118655A (en) 1983-11-02
FR2476574A1 (fr) 1981-08-28
JPS6215389B2 (fr) 1987-04-07
DE3106241C2 (fr) 1993-04-01
GB2118655B (en) 1984-06-06
GB8312470D0 (en) 1983-06-08
DE3106241A1 (de) 1982-01-07
FR2476574B1 (fr) 1982-03-12
GB2070170A (en) 1981-09-03

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